Urban: His understanding is incredible, and he becomes an immortal starting from practicing martial

a month later

"Plop!! Plop!!!"

The heartbeat sounds like a war drum, and the sound waves of the same frequency resonate, causing the kinetic energy to be transmitted to the limbs, bones, internal organs... and penetrate deep into the bone marrow.

In addition, various chemical substances are integrated into the bone marrow and absorbed by the bone marrow. , making the bone marrow healthier and stronger.

Adult bone marrow is one of the largest tissues in the human body. It is divided into red bone marrow and yellow bone marrow according to its structure.

Red bone marrow is the hematopoietic tissue of the human body and is distributed in the bone marrow cavity. Harvard's There is also a small amount in the tube, which is mainly composed of blood sinusoids and hematopoietic tissue.

Sinusoids are sinusoidal cavities formed after arterial capillary branches enter the red bone marrow. They are irregular in shape and vary in diameter. The sinus walls are lined with endothelium. cells, with basement membrane and pericytes attached to the outside.

The hematopoietic tissue is located between the blood sinusoids. Its matrix is ​​reticular fibers and reticular cells, which form a grid. The mesh is filled with various free cells, such as those at different developmental stages. All kinds of blood cells and mesenchymal cells, etc.

During the newborn period, the bones are filled with red bone marrow, which has active hematopoietic function.

In adulthood, red bone marrow mainly exists in the epiphyses of some flat bones, irregular bones and long bones. It is most abundant in the vertebrae, sternum and ilium, and has the most active hematopoietic function.

In addition to hematopoietic function, red bone marrow also has many functions such as defense, immunity and wound repair. Its wound repair function is mainly due to the immature mesenchyme in it. cells, they retain the potential to differentiate into fibroblasts and osteoblasts.

Some scholars have used bone marrow stromal cells cultured in red bone marrow to implant into fractures and bone defects, confirming that they can promote the formation of bone tissue and be beneficial to the healing of fractures and defects. Repair.

Yellow bone marrow is mainly composed of adipose tissue, that is, a large number of bone marrow stromal cells turn into fat cells, with only a small amount of immature cell clusters, and its hematopoietic function is weak. Adult yellow bone marrow can produce red blood cells, granulocytes, platelets and some lymphocytes. Cells.

Many factors are involved in the regulation of bone marrow hematopoiesis: the reduction of oxygen in the blood stimulates the formation of red blood cells; similarly, living at high altitudes increases the number of red blood cells; blood loss enhances the mitosis of cells in the bone marrow; proteins in food promote the formation of red blood cells; Vitamin B2 is necessary in the normal process of red blood cell formation.

In adults with severe anemia and blood loss, yellow bone marrow can transform into red bone marrow.

As the bone marrow is exercised to the extreme, Bai Xuan can clearly feel the subtle changes in the body.

When the bone marrow The cells become more active, and part of the system is integrated into the bone tissue, which not only begins to strengthen the bones to a certain extent.

It also prompts the bones to secrete some impurities that are difficult to eliminate, making the bones harder and cleaner.

And these impurities naturally follow It is quickly eliminated through the body's excretory system.

Part of it enters the intestines, part of it enters the kidneys, and part of it is naturally secreted by the skin as the pores open.

Not only that, the hematopoietic function of the bone marrow has also been greatly improved. , begin to rapidly produce healthier and more nutritious new blood.

The new blood blends into the old blood, and can naturally excrete part of the old blood as garbage.

Like impurities in bone tissue, part of the old blood enters the intestines, and part Enters the kidneys, and some is excreted by the skin as the pores open.

"It's time to take a bath"

"I have to go to the toilet after taking a shower"

"Yijin, marrow cleansing, marrow refining and blood exchange……"

"This movement is greater than the perfection of external refining and the perfection of internal refining."

"It seems that my body is about to undergo a major transformation."

While thinking, Bai Xuan walked into the bathroom.

Take a shower first, and then defecate.

Then he stood in front of the mirror, looking at himself who seemed three or four years younger. Bai Xuan didn't know what to say for a while.

"Although the height has not changed, the facial features have not changed either"

"But the overall temperament and this special feeling really make me feel three to four years younger."

"This change seems a bit beyond my expectation"

"However, I can also deduce one or two of the principles."

"It’s just that almost all my functions have been improved, and exercising my bone marrow to the extreme has become a threshold point, causing me to experience reverse growth."

"But the only question I'm concerned about now is whether this reverse growth phenomenon can return my body to puberty and grow again."

Bai Xuan knows that after human individuals enter the period of puberty and development, the speed of individual growth and development is greatly accelerated, and a second peak of growth and development occurs, which is called the growth spurt of puberty. During the period of puberty and development

, the activity of human hormones is enhanced, especially the growth hormone in the body. , the release of thyroid hormones, leading to rapid growth in height and weight.

The increase in height and weight will naturally enhance body functions.

There is a secondary growth acceleration in the circulatory system, the heart rate and pulse begin to slow down, the lung structure gradually improves, and the alveoli The capacity increases, the respiratory function is further strengthened, and the lung capacity increases.

During this period, the total amount of white matter in the brain will increase linearly, and the total amount of gray matter will show a U-shaped trend.

The prefrontal cortex is responsible for high-level cognitive functions such as decision-making and cognitive control. More myelin will be formed, making individual information processing more efficient.